Slant Six Forum :: Holley Pro-injection 2d

The TBI unit itself is a decent item. The computer it came with, however, has two big obstacles to installing it on a slant six.

1. It's programmed for a smallblock Chevy, and the screwdriver tuning doesn't give you enough adjustment to change the map to what a slant six needs.

2. It's an alpha-N system, uses just RPM and throttle position for the fuel calculations. It's much easier to make a speed density or MAF based system work well.

I would only use a Pro-Jection setup like a parts car - rather than using the entire thing, take the parts off it that work and replace the ones that you don't need.

Author:	Plum Crazy [ Mon Apr 14, 2008 7:42 pm ]
Post subject:	Holley Pro-injection 2d
Has anybody tried to use one of these 2 barrel fuel injection systems on a slant 6. I've see these units at swap meets very often for under 500 bucks. Seems like it would be perfect because all the small cfm 670 and price. I don't think a mild motor would need much more.

Author:	DusterIdiot [ Mon Apr 14, 2008 9:17 pm ]
Post subject:	Lou...
Lou has run this with some dissapointing results, I think due to it being TBI instead of MPI, and mostly because the old 2di analog computer was a pile of garbage, it should do better with the new Commander 950 computer ($$$), or the megasquirt computer might be and OK driver... -D.Idiot

Author:	Joshie225 [ Mon Apr 14, 2008 9:20 pm ]
Post subject:
Lou, where are you!? Lou had trouble with the analog Pro Jection and I don't think the digital with the knobs for tuning would be much better. I know the throttle body with Mega Squirt control works well, but it was a lot of work to get right.

Author:	Sam Powell [ Tue Apr 15, 2008 5:57 am ]
Post subject:
I think its always alot of work to get it right. Sam

Author:	Matt Cramer [ Tue Apr 15, 2008 6:10 am ]
Post subject:
The TBI unit itself is a decent item. The computer it came with, however, has two big obstacles to installing it on a slant six. 1. It's programmed for a smallblock Chevy, and the screwdriver tuning doesn't give you enough adjustment to change the map to what a slant six needs. 2. It's an alpha-N system, uses just RPM and throttle position for the fuel calculations. It's much easier to make a speed density or MAF based system work well. I would only use a Pro-Jection setup like a parts car - rather than using the entire thing, take the parts off it that work and replace the ones that you don't need.

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Holley Pro-injection 2d https://www.slantsix.org/forum/viewtopic.php?t=28388	Page 1 of 1

Author:	Dart270 [ Tue Apr 15, 2008 7:46 am ]
Post subject:
I have the 2bbl Holley TBI system on my 64 Dart with the Megasquirt 2.2 ECU running it. Currently mid 14s in the 1/4 and 24 mpg hwy. I would not bother with the old Holley computers - wasted a million hrs on those piles of .... Lou

Author:	68barracuda [ Thu Apr 24, 2008 2:40 am ]
Post subject:
Quote: The TBI unit itself is a decent item. The computer it came with, however, has two big obstacles to installing it on a slant six. 1. It's programmed for a smallblock Chevy, and the screwdriver tuning doesn't give you enough adjustment to change the map to what a slant six needs. 2. It's an alpha-N system, uses just RPM and throttle position for the fuel calculations. It's much easier to make a speed density or MAF based system work well. I would only use a Pro-Jection setup like a parts car - rather than using the entire thing, take the parts off it that work and replace the ones that you don't need. Like I am doing with my 4Di on my 318 - I am bolting a haltech f10x in

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